For 2024 tax returns the official FTA exchange rates are:

    IncomeWealth
USD1   =  CHF 0.88013929CHF 0.906250
EUR1   =  CHF 0.95238254CHF 0.938450
GBP1   =  CHF 1.12509806CHF 1.135038

Official foreign exchange rates as of 31 December 2024 are available here. In this list are also included rates to apply for the main cryptocurrencies (these are found with the list of national currencies). These need to be reported in the tax declaration.

BTC 1 = CHF 85,926.486363
ETH 1 = CHF 3,083.556280
BCH 1 = CHF 406.351743